MCP HeartbeatTHE MCP OBSERVATORY
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Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

DiscoveryServer directory

Remote MCP servers

Find a server for your workflow, with connection evidence you can inspect.

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3337 servers

Ordered by checks passedClear filters
Dated server measurements. The status describes the last probe or a listed authentication requirement. Checks that have not been measured are not failures. Open a server to inspect the evidence.
Server / capabilityLast probeMedian latencyChecks passedLast checked
NPI Who

US health care providers by NPI, name or phone, with payments, Medicare, OIG and facility data.

HealthcarePayments & trading

Outdated check797 ms13 / 22
Xpress Flow Systems

No-sign-up eSIMs for 200+ countries, phone-number eSIMs, domains and proxies. You approve payment.

Finance & CryptoPayments & trading

Responded808 ms13 / 22
PaidHandshake Exchange

Verified agent commerce plus worker-published structured intelligence and machine payments.

Finance & CryptoPayments & trading

Responded827 ms13 / 22
io.github.kodandy/jp-m2m-gateway

Raw Japanese regulatory data for AI agents: pension, gazette, gBizINFO. x402-metered (USDC).

Finance & CryptoPayments & trading

Outdated check828 ms13 / 22
io.github.kodandy/jp-crypto-tax-rules

Machine-readable Japanese crypto-asset tax rules for AI agents: rules-as-code with citations, x402.

Finance & CryptoCode & DevOps

Outdated check832 ms13 / 22
io.github.kodandy/jp-biz-opportunity

Japanese public-sector business opportunities for AI agents: tenders, subsidies, sanctions. x402.

GovernmentCode & DevOps

Outdated check833 ms13 / 22
AgentPay x402 Facilitator

Verify signed x402 payments; treasury-scoped settlement is irreversible.

Finance & CryptoPayments & trading

Responded854 ms13 / 22
MyZucoins

Search guides, wallet help, developer docs and news for Zucoin's Splitchain layer 1 network.

Finance & CryptoPayments & trading

Responded862 ms13 / 22
xyz.loadbay/loadbay

Catalog of 370+ open-source AI-agent harnesses. Search, list your own, earn USDC tips via x402.

Finance & CryptoPayments & trading

Outdated check871 ms13 / 22
x402Shield

Public demo: evaluate AI-agent payment authorization and approval policy. No signing, no settlement.

Finance & CryptoPayments & trading

Responded882 ms13 / 22
io.github.realopengroup/mcp-server

Verify crypto wallets and generate proof of funds letters for buying real estate with crypto.

Real Estate & PropertyPayments & trading

Outdated check885 ms13 / 22
io.github.TMCHALK/sftunes

Hand-made human mixtapes with liner notes. Paid tools $0.01 USDC via x402, 80% to the tapemaker.

Finance & CryptoPayments & trading

Responded886 ms13 / 22
Assay: settlement verification

Verify crypto payments really settled and how much arrived. 20 chains. Read only, no API key.

Finance & CryptoPayments & trading

Responded888 ms13 / 22
Exchange.news — Crypto offers, campaigns and news

Read-only crypto signup codes, partner links, sourced campaign dates and the latest crypto news.

Finance & CryptoPayments & trading

Responded893 ms13 / 22
PostalForm

Create mail drafts, upload PDFs, browse forms, track orders, and pay via MPP or x402.

Finance & CryptoPayments & trading

Responded907 ms13 / 22
Agent Harbor pay-per-call tools

Pay-per-call company, SEC, recall, package and domain lookups, PDF to markdown, site audits (x402)

Developer ToolsFile & docs

Responded910 ms13 / 22
VARRD — Statistically Validated Trading Edges + AI Research Engine

Validated trading edges across futures, equities, crypto. Live signals, full audit trail.

Finance & CryptoPayments & trading

Outdated check916 ms13 / 22
ScanPay — Code Security Oracle

Deterministic code security scan + tx preflight, paid in USDC via x402.

Finance & CryptoPayments & trading

Outdated check925 ms13 / 22
com.maltapropertytax/site

Malta Property Tax: the site's own MCP server — enquiry (enquiry = a human handoff, not a...

Finance & CryptoPayments & trading

Responded926 ms13 / 22
io.github.webios2026-byte/solradar-mcp

Solana meme-coin trust scores, rug-risk flags, and wallet analytics from SolRadar.

Finance & CryptoPayments & trading

Responded952 ms13 / 22
io.github.petrkrulis2022/touchstone-mcp

Dated SIU, the benchmark price of AI inference work: one free tool, three paid via x402.

Developer ToolsCode & DevOps

Responded960 ms13 / 22
x402image

x402 image tools (USDC/Base): remove_background/upscale $0.02, resize/optimize $0.005; URL in/out

Finance & CryptoPayments & trading

Responded963 ms13 / 22
VIA - Web/PDF extraction and API comparison

Web/PDF extraction and API comparison. x402 payments or prepaid comparison credit. Free discovery.

Finance & CryptoPayments & trading

Responded968 ms13 / 22
io.github.mercuryx402/mercury-x402-mcp

Agent-payable web data over x402: 18 keyless services an agent pays per call.

Developer ToolsCode & DevOps

Outdated check968 ms13 / 22

Automated measurements. Not a rating. Unmeasured checks are not failures. How to read the evidence